Mouth piece 62% copper to promote chewing and flow of saliva. The copper alloy is nickel-free, rings stainless steel. Thickness 1.8cm. Ring Width: 7cm. Olive-shaped central part, stainless steel ringsThe new bit from Waldhausen contains 62% copper, which promotes the horse's salivation and chewing. The alloy is nickel-free, and the rings are made of stainless steel.Thickness: 18 mm, Rings: Ø 7 cm